I agree with Peter, if the guiding stopped, and assuming Herr Ponders' drift alignment was woeful, then the star should reacquire, but with the obvious consequences, of trailing while it does the reacquisition. Hmm, maybe.
"Observatory Window" as in Maxim, like Robin said. This effectively means you can calibrate where you want, and then shift to other areas without having to recalibrate again.
Gary
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